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Published online 27 October 2006
Published in J Environ Qual 35:2075-2083 (2006)
DOI: 10.2134/jeq2005.0467
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Bioaccessibility of Lead Sequestered to Corundum and Ferrihydrite in a Simulated Gastrointestinal System

Douglas G. Beaka, Nicholas T. Bastaa,*, Kirk G. Scheckelb and Samuel J. Trainac

a School of Environment and Natural Resources, The Ohio State University, Columbus, OH 43209
b National Risk Management Research Laboratory, USEPA, Cincinnati, OH 45224
c Sierra Nevada Research Institute, University of California-Merced, Merced, CA 95344


Figure 1
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  		Fig. 1. X-ray diffraction pattern for ferrihydrite. A = unaltered ferrihydrite, B = iron phase removed.

 

Figure 2
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  		Fig. 2. X-ray diffraction analysis of corundum.

 

Figure 3
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  		Fig. 3. Bioaccessible (A) Pb and (B) Al for selected sorbed concentrations of Pb sorbed to corundum.

 

Figure 4
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  		Fig. 4. Bioaccessible (A) Pb and (B) Fe for selected sorbed concentrations of Pb sorbed to ferrihydrite.

 

Figure 5
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  		Fig. 5. Extended X-ray absorption fine structure (EXAFS) spectra for Pb sorbed to corundum. Fits are shown as dotted lines.

 

Figure 6
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  		Fig. 6. Extended X-ray absorption fine structure (EXAFS) spectra for Pb sorbed to ferrihydrite. Fits are shown as dotted lines.

 

Figure 7
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  		Fig. 7. X-ray absorption near edge spectroscopy (XANES) comparison of Pb sorbed to corundum and ferrihydrite with model Pb compounds.

 




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